Callogaza watsoni Dall, 1881

Cavallari, Daniel C., Salvador, Rodrigo B., Dornellas, Ana P. S. & Simone, Luiz R. L., 2019, Calliostomatidae, Colloniidae, Margaritidae, and Solariellidae (Gastropoda: Trochoidea) collected by the Marion Dufresne (MD 55) expedition in southeastern Brazil, with description of a new species of Calliostoma, Zootaxa 4609 (3), pp. 401-428 : 414

Callogaza watsoni Dall, 1881

( Fig. 6 A–F)

Synonymy see Quinn (1979) and Simone & Cunha (2006). Complement:

Callogaza watsoni Dall, 1881: 50 ; Simone & Cunha, 2006: 22 , figs 41–44, 58–60; Rosenberg et al., 2009: 624.

Gaza (Callogaza) watsoni: Quinn, 1979: 25 ; Rios, 2009: 55.

Type material. Holotype: MCZ 7544 .

Type locality. Cuba, off Havana, 24°34’N, 83°16’W, 324 m (Blake Expedition, 1877) .

Previously known distribution. From the Yucatan strait to Northeast Brazil ( Simone & Cunha, 2006), live specimens from 66–1170 m, usually deeper than 250 m ( Quinn, 1979).

New occurrence. Southeast Brazil, off Espírito Santo, Abrolhos Slope.

Habitat: Coralline and sandy bottoms.

Material examined. Brazil: Espírito Santo: off São Mateus, Abrolhos Slope, 18°59’S, 37°50’W, MD55 sta. DC 75, 295 m , MNHN, 9 sh (27/v/1987) ; 18°59’S, 37°48’W, MD55 sta. DC73, 607– 620 m , MNHN, 2 sh (27/ v/1987) ; 19°40’S, 37°48’W, MD55 sta . CB77 , 790– 940 m , MNHN, 2 lots (1 + 4 sh) (27/v/1987). Additional non- MD55 material: Cuba: holotype .

Measurements. ~5½ whorls, H= 7.2 mm, D= 9.2 mm (largest juvenile specimen).

Remarks. The present specimens are young individuals with up to 5½ whorls. Adult specimens have around 7 whorls according to Simone & Cunha (2006). Additionally, juveniles lack a well-developed callus and reflected lip. The MD 55 specimens compare well with the holotype in that they present the strongly marked reticulate sculpture on the apical side of the whorls ( Fig. 6 B ), the dominant well-marked spiral sculpture that produces a slightly keeled shell profile ( Fig. 6 A ), and a similarly sculptured periumbilical region, with numerous axial furrows ( Fig. 6 C ). The youngest specimens (~3¾ whorls, protoconch included) have a distinct rounder profile ( Fig. 6 E ), which is compatible with the earliest whorls of older individuals. Nevertheless, the first spiral cords appear at 3½ whorls ( Fig. 6 F ), at which point the shell becomes characteristically keeled. The specimens analyzed here are very similar to the individual reported by Simone & Cunha (2006: figs 58–60), which was mentioned by Dall (1889: 342) as a record from Brazil. Dall’s specimen was collected off Fortaleza, Ceará state, R/V Albatross sta. 2756, at 716 m depth. The present records thus represent a range expansion of over 1,800 km further south to Brazilian waters.

Figures

FIGURE 6. Margaritidae collected by the MD55 expedition. A–F. Callogaza watsoni. A. MNHN, sta. CB77, spm #1, apertural view (H=6.0 mm, D=8.0 mm). B. MNHN, sta. DC75, under SEM, apical view (D=6.7 mm). C. MNHN, sta. CB77, spm #2, under SEM, umbilical view (D=6.2 mm). D. MNHN, sta. DC75 under SEM, detail of apex. E–F. MNHN, sta. SY74, juvenile specimen (H=1.6 mm, D=2.3 mm). E. apertural view. F. apical view. G–L. Gaza compta. G–I. MNHN, sta. CB77, juvenile specimen (10.2 mm, D=14.1 mm). G. apertural view, H. apical view. I. umbilical view. J–L. MNHN, sta. CB93, juvenile specimen #1 (H=1.7 mm, D=2.7 mm). J. apertural view. K. apical view. L. detail of apex under SEM.